The rapid expansion of angiosperms late in the
Mesozoic era appears to be related to their
coevolution with
a. dinosaurs.
b. gymnosperms.
c. insects.
d. mammals.
e. birds.
Answer: c
You might also like to view...
Franklin’s assignment at King's College was to
investigate the structure of a. proteins. b. coal. c. DNA. d. carbohydrates. e. lipids.
Parasites impact host populations by
a. draining nutrients from hosts. b. making hosts more vulnerable to predation. c. lowering birth rates and raising death rates. d. causing sterility e. all of these.
(a) Describe by labeled diagram the structural components of the lac operon in E. coli
(b) State the function of the lac regulator gene. (c) State the function of ?-galactosidase in the lac system. (d) Show by diagram the manner in which lactose brings about transcription of the three structural genes of the lac operon. (e) Explain why certain mutations in the regulator gene (I-) of the lac system result in maximal synthesis of ?-galactosidase, permease, and transacetylase even in the absence of the inducer (lactose).
Pollen of one plant species will not germinate on the flower of another species. This is an example of:
A) hybrid inviability. B) temporal isolation. C) gametic isolation. D) hybrid infertility.